Question about 1994 Plymouth Voyager

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1994 Plymouth Voyager a/c

My 94 Voyager switches the a/c from the a/c vents to the heater and/or the defrost vents. It will blow out of the a/c vents for a while, then it starts blowing out of another place. It seems to do this when the engine is under load, such as going uphill or speeding up. I suspect it is caused by a vacuum drop, but I don't know where to start looking for a cause. Any help will be appreciated.

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  • willobi Jun 14, 2009

    I have a small part that appears to be a check valve attached to a port on the power brake booster. It has a very small nylon line that goes through the firewall with the a/c lines. Could this be what I am looking for?



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YES your problem is vacuum loss. look under the hood for a vacuum canister, most of them are black plastic cans, there should be two vacuum lines on it one goes to the intake manifold and the other to your a/c controll head, the one going to your controll head may even have a check valve in it, if yours has a small plastic valve in it then remove it and try to blow through both ends of it, air should only flow through it in one direction which is going toward the engine, look at the vacuum lines close and make sure they dont have any holes in them, check the vacuum canister for leaks,

your problem is in the vacuum system just look at it close.

if i can help any more

Posted on Jun 14, 2009

  • WESLEY SCHACHT Jun 14, 2009

    yes i believe that is it, check it for breaks and leaks



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